Feeding mechanism for sewing machines



Dec. 19, 1922.

co E i J. R. MOFF'ATT.

FEEDING MECHANISM FOR SEWING MACHINES.

FILED JUNE I0, I920.

4 SHEETS-:SHEET I.

Dec. 19, 1922.

J. R. MOFFATT- FEEDING MECHANISM FOR SEWING MACHINES.

4 SHEETS-SHEET 2.

FILED JUNE 10, I920.

Dec. 19, 1922.

1,439,432. 1. R. MOFFATT.

FEEDING MECHANISM FOR SEWING MACHINE S.

FILED JUNE 10, 1920 EE EEEEEEEEEEEE 3- Dec. 19, 1922.

J. R. MOFFATT. FEEDING MECHANISM FOR SEWING MACHINES.

4 SHEETSSHEET 4.

FILED JUNE 10, 1920- aim-ea Dec. is, 192a.

1 was stares rare JAMES n. Morn-Arr, or onroaeo, rriLrn ors, assrenon' ro nnion srnorari raacnrnn COMPANY, or cnrcaeo, rririrnors, A. oonrosnrron or rumors.

v FEEDING Mncnanrsm ronsnwnvs Maoniivns.

i Application filed June 10,

T whom it may concern: r

Be it known that 1, JAM S MorFATT, a citizen of the United States, residing atChicage, in the county ofCook State of Illi nois, have invented'certain new and useful Sewing Machines, of whichthe following is a description, reference being had to the accompanying drawing and to the figures of reference marked thereon;

The inventionrelates to new and useful improvements in feeding mechanisms for sewingmachines, and more particularly to a sewing machine having a standard carrying awork supporting arm inwhich the feeding mechanism is located. g An object of the invention is to provide a sewing machine of the above character with a feeding mechanism-whichis so constructed and arrangedthat the work supporting armhousing the feeding mechanism may be made relatively small throughout its entire length so thateomparatively small tubular articles may be stitched on themachine. 5 1

i A further object of the invention is to provide a machine of the-above character having a' differential feeding mechanism wherein the means forimparting longitudinal movements to the feed dogsis '10- cated in. the standard of the machine, eX-

"cept for the longitudinally extending 'members which directly impart the movements tothe feed members carrying the respec tive feed dogs.

These and other objects will in' 'part be obvious and will .in r part be hereinafter I more'fully disclosed."

In the; drawings which show by wayof illustration one embodiment of the; inven 'tion: H i 1 Figure 1 is a side view of a portioniof the machine having my improved means embodied therein;

Fig. 2 is a'view from the rear ofthe machine with parts in section and partsbroken away to show the mechanism for operating the feed dogs; i

' Fig.3 is a view partly in plan and partly in section showing a portion ofthe cylinder and showing the feeding mechanism j'ex cept for the eccentric 'strapsyand eccen tries which operate theseveral parts of the; feeding mechanism;

,Fig. 4 is view in longitudinalsection 'ing from said standard 2 is a work su 1920. serial No.-387,936. I

through a portion of the standard and the i k upporting Cylinder showing the feeding 'HlQCllEtIllSIH in side elevation;

Fig; 5 is a'view showing more or less diagranimatically the mechanism for impart lmprovementsln Feeding Mechanism for ing'longitudinal movements to the auxiliary feed dog, the feed dog being of Its stroke; and

at the rear end Fig. 6'is a similar view but showing the feed dogs atthe'forwardend of their stroke' of the general type shown and described in my'prior Patent #1,209,609,' granted Deeemher l9, 1916, whereina'work supportingcylinder is provided 'which- {is located a feed. dog and an auxiliary feed'dog disposed My improvement is directed to a machine 2 7O feeding mechanism consisting of one main so as to feed the material lengthwise of the work supporting cylinder. It will be noted that the difierential movements imparted I to'th'e main feed dog and fauxiliaryfeed dog insaid patent, are derived from device's lo-' cated within the work supporting cylinder, and as, a consequence, the cylinder is considerably enlarged adjacent the supporting standard to accommodate this mechanism. The present invention .is directed to a rearrangement and modification of the parts shown in said patent so'that the mechanism I for imparting differential movements to} the. maln feed dogma auxiliary feed dog may be placed in the standard and the work supporting cylinder therefor" may" be made very much smaller thus providingaimachine wherein very small tubular articles may be stitched.

I Referring more in detail to the drawings, 7 1, my improved machine consists of a supporting bed 1 'carryingalstandard 2 on which isimounted an overhanging arm Project pp'ortirig cylinder 4. 'Said cylinder is bolted to [the standard 'andsuspended thereby and extends outwardly therefrom underneath the overhanging armfl. jMounted'to reciprocate'in the 'overhanging arm 8 is aneedle bar5vcarryinga needle 6. Also mounted on the overhanging arm is 'a presser foot ,7'wliich operates to hold the .material on the work support; As shown inithe drawings, the material is fed lengthwise of the workisuppor t'by a main feed dog 8 located nrrear of theneeclle,"and the auxiliary. feed dog 9 located in frontof' the needle; Asin priorpatent; it is desirable to give a slightlydifi erent movement to the auxiliary feed dog, or what is known in the art, a differential feeding movement is imparted to the main and auxiliary feed dogs. EX-

te'nding transversely of the standard 2 is a main shaft '10 and the needle bar is reciprocated-by suitable connections with said cross shaft. v

Themain feed dog 8 is mounted on: the

main feed bar 11. This main feed bar 11 is formed with a cylindrical section 12 on whiehis mountedasleeve 13. The auxiliary feed bar 9 is carried by this sleeve 13. The main feed bar l-l-isformed with afork :14 at itsrear end,*which straddles the pin 15 carried by the oscillating bracket 16.

Thisoseillating bracket 16 is pivoted at 17 and 1s swung about this 'PIVOll bY means of an eccentric strap 18 co-operating with the eccentric 19011 the cross shaft 10. Said eecentric strap 18 is pivoted at -20'to the 0'seillating bracket 16. A link21 is pivoted at 22 to the feed bar/11 andthe other'end feed dog;

oft-his linkispivoted to an adjustable pivot .bolt 23. Saidfpivot bolt 23 may be shifted longitudinally ina slot 24 in the bracket 16,v and as this adjustable pivot bolt 23 is shiftechfit is moved toward and fro the pivot point 17' of the oscillating bracket 16. As this bracket oscillates, this link 21 imparts endwise movements tothe feedbar 11 and thelength' of the movement imparted tothe feed bar depends upon the position of the iuljustable bolt 23. Said adjustable bolt 23 is extendedas clearly shown in Fig.

v3 soas to provide means whereby it may be easily shifted by hand.

The feed dogsareraised and loweredby raisingand lowering-the front end of the main feed bar which swings on the pivot pin 15, durmg these ,movements.

pivoted to-a link 27 at 28 and the upper end of this link is pivoted at 29 to the sleeve 13 carrying the auxiliaryv This sleeve, as above noted.-

ismounted on the cylindricalportion 12 of the main feed bar 11 andasthe sleeve moves up;and down, the forward end of the feed bar will move up and down. The section 11 oft-he feed bar is in theformof a sleeve which is split at its front end and thecylin drical section 12 extends into sa d sleeve sec- "tionand isclampedftherein by means of a screwB-O. The rear end of tihe lever 25 is pivoted at 31 to a-n eccentriozstrap 32 which cooperatesw'ith aireccentric 33 on the shaft 10. thisshaft rotates, the lever 25 will she oscillated and this will simultaneously raise andlower the'feed dogs. As a means -fo1': 'moving the sleeve :endwise for v impart-v 1- ing feeding-movements to theiauxiliary feed dea haveep avided IQQk nBt w is -movement to the right and as the main feed -ment 1 to the left. nient of the arm a2 in a measure, is similar Extend. ing lengthwise ofthe work supportingicyl inder 4 is a lever 25. This lever is pivoted at 26. The-front end of said lever is -also is pivoted at 35 to the main feed bar so that said rock lever moves back and forth with the main feed bar. Said rock lever has a downwardly extending arm 36 provided with a slot '37, A. link 38 is pivoted to a pivot bolt 39 adapted to slide in the slot 37. .Tlheother end of the link 38 is pivoted at 40 to'th'e sleeve 13 carrying the auxiliary feed dog. Said link is extended to form a handle 41 by which it may be shifted to change the point of connection with the arm -3,6,-that is, to move said point of connection vtoward and fromyth'e pivot'point of the rock lever li lounted on the oscillating bracket 16 is a rigid arm 12 and said arm, 42 is pivotally connected bylink 43 with-the arm 44: of the rock lever 34. As the bracket 16 oscillates, it raises and lowers thearm 42, and through thispivotal linkconnection 13 will swing the rock'lever34 on its pivot 35. It will be notedthat the arm 12 partakes of the same general movement as the main feed bar, that is, as the main feed bar moves to the right, thearm 42 has a bodily bar moves to the left,the arm 42 has a move- This bodily moveto the bodily movements of the rock lever 3 1, but said arm 42 as it moves bodily, also oscillating the same, are all disposed within I the standard. Also the pivot pin 15-for the feed bar is likewise in thestandard, and the main feed bar extends into the standard.

In fact, all the mechanism for moving the.

feed dogs back and'forth is in the standard,

exceptthe rock lever and the link eonnections to the main feed bar, and the sleeve carrying theauxiliary, feed dog. By this ar rangement of parts, the work supporting cylinder at the point where it joins the standard, may be made relatively small so that small tubular articles may be stitched.

It is obvious that minor changes in the details ,of construction and arrangement of parts may be made. without departing from. the spirit of the nvention. as set forth'in the appended claims.

Having thus described the nwention, what 1 claim as new and desire to secure, by Letters-Patent, is:-'

1. Ansewlng machine including in com- ]bination a standard, a relatively small work supporting cylinder carried thereby and projecting;therefrom, avmain feed bar located in said cylinder and extending lengthwise thereof into said standard, a main feed dog carried thereby, a sleeve mounted on said main feed bar for endwise movement thereon, an auxiliary feed dog carried by said sleeve, means for raising and lowering the front end of said feed bar together with the sleeve thereon, an oscillating member located in said standard, means for oscillating the same, said oscillating member having means for supporting the rear end of the main feed bar, means connected to the oscillating memberffor moving the feed bar back and forth, and means con nected to said oscillating member for moving said sleeve back and forth on said main feed bar.

2. A sewing machine including in combination a standard, a relatively small Work supporting cylinder carried thereby and projecting therefrom, a main feed bar lo-' cated in said cylinder and extending lengthwise thereof into said standard, a main feed dog carried thereby, a sleeve mounted on said main feed bar for endwise movement thereon, an auxiliary feed dog carried by said sleeve, means for raising and lowering the front end of said feed bar together with the sleeve thereon, an oscillating merober located in said standard, means for oscillating the same, said oscillating member having means for supporting the rear end of the main feed bar, means connected to the oscillating member for moving the feed bar back and forth, means connected to said oscillating member for moving said sleeve back and forth on said main feed bar, said last-named means including a rock lever pivoted to the main feed bar, a

link pivoted to the sleeve and having an adjustable connection with the rock lever, and an arm rigid with the oscillating member and having pivotal connection with the rock lever.

3. A sewing machine including in combination a standard, a relatively small work supporting cylinder carried thereby and projecting therefrom, a main feed bar located in said cylinder and extending lengthwise thereof into said standard, a main feed dog carried thereby, a sleeve mounted on said main feed bar for endwise movement thereon, an auxiliary feed dog carried by said sleeve, means for raising and lowering the front end of said feed bar together with the sleeve thereon, an oscillating member located in said standard, means for oscillating the same, said oscillating member having means for supporting the rear end of the main feed bar, means connected to the oscillating member for moving the feed bar back and forth, means connected to said oscillating member for moving said sleeve back and forth on said main feed bar, said last-named means including a rock lever pivotally carried by said main feed bar and bodily moving there with, said rock lever having a depending arm provided with a slot, a link connected to a pivot bolt adjustable in said slot and t said sleeve, a rigid arm carried by the oscillating member extending substantially horizontally therefrom, said rock lever having a substantially horizontal arm pivotally connected to said rigid arm on the oscillating member.

In testimony whereof I afiix my signature.

JAMES R. MOFFATT. 

